310 University of California Puhlicationii in Botany [^'o\.. 10 



Riccardia bistrata sp. iiov. 



Plate 85 



Dioicous. Medium size, greenish brown in color; loosely eaespitose. 

 Fronds irregularly pinnate, very thin, bistratose, 40 to 50 cells wide 

 with wings of layer of single cells 2 to 4 cells wide; branches 20 

 cells Avidc, unistratoso. Imperfect flowers opposite, semicircular; 

 bracts laciniate, laciniae 4 cells long, 1 to 2 cells wide. 



Dimensions. — Fronds 1 inch long; 1.5 mm. wide; .05 mm. to .075 

 mm. thick ; imperfect involucres .4 mm. X -4 mm. ; laciniae of bracts 

 .2 mm. long. 



7/r/?>(7flf.— Pipiriki, North Island, New Zealand, Mav 29. 1904, 

 Coll. W. A. Setchell. Type, Herb. Univ. Calif., no. 213706. 



Observations. — This is the thinnest and most remarkable species 

 of Riccardia I have seen, and none like it is recorded by Stephani 

 in his Sp. Hep. ; repeated cross-sections of the frond never show more 

 than a layer of 2 colls, with the branches and young fronds uni- 

 stratose. 



That this may be an aquatic form of some other species is possible, 

 but there are numerous imperfect female involucres on the fronds 

 which indicate a certain maturity. 



Riccardia riccioides sp. nov. 

 Plate 86 



Dioicous. Small ; dark brown in color, densely eaespitose. Stems 

 suberect, rhizomatous; rhizomes numerous, minute, terete, 10 cells 

 in diam., often bearing male amentula ; irregularly furcate, f astigiate, 

 branches cuneate, broader than chief trunk which is thick, broadly 

 oval on cross-section, 15 cells thick, 20 broad, margin acute, often 

 ] cell ; cortical cells smaller, dark colored ; branches broader and 

 thinner, slightly biconvex, 10 cells thick X 30 cells wide, margin of 

 trunk and branches often one cell winged. Calyptra pyriform, below 

 slightly verrucose, above densely papillose, papillae long, striolate; 

 apex coronate ; on cross-section 6 cells thick, two outer layers of cells 

 dark colored. 



Male amentula basal radiate, 4 to 8 on a branch, rarely single, 

 4 to 5 pairs of alveolae. 



Dimensions. — Fronds 14 to 1 inch long; trunk 1.25 mm. broad 

 X .6 mm. thick ; branches 2 mm. broad X .3 mm. thick ; rhizomes 

 .4 mm. diam. ; calyptra 2.25 mm. X 1 mm. broad ; corona .2 mm. 

 high X .3 mm. wide; papillae .2 mm. long X .05 mm. thick; male 

 amentula 1 mm. long X .4 mm. thick. 



Habitat. — ]\Iamaku Bush, North Island, New Zealand ; coll. W. A. 

 Setchell, 1904, no. 157. Type Herb. Univ. Calif., no. 213708. 



